National Repository of Grey Literature 743 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Integration of environmental education topics into chemistry edcuation - water
Batoušková, Anna ; Janoušková, Svatava (advisor) ; Teplý, Pavel (referee)
This bachelor's thesis brings teaching tasks for secondary school students that could serve as teaching material for chemistry classes. The tasks link chemical topics related to water and its pollution with the cross-cutting topic of Environmental Education. The teaching tasks aim to develop students' scientific literacy. The inspiration for the development of the teaching tasks was the comprehensive tasks of the international survey PISA (Programme for International Students Assessment). The tasks were tested on grammar school students, who provided feedback concerning the difficulty of individual tasks or subtasks and also with regard to familiarity with the topic and its attractiveness. The most difficult tasks for the students were those working with calculations. The least challenging tasks were those based on searching for information in text or graphs and tables. Students rated the topics of the tasks as exciting and necessary. Key Words scientific literacy, learning tasks, environmental education, water, chemistry
First-Principle Study of Electronic Properties of Ultrathin Layers
Nezval, David ; Vázquéz, Hector (referee) ; Friák, Martin (referee) ; Bartošík, Miroslav (advisor)
Tato práce charakterizuje strukturní vlastnosti adsorbovaných atomů galia a molekul vody na grafenu. Zkoumá také změny elektronových vlastností grafenu způsobené adsorpcí jednotlivých adsorbentů. Výpočty pomocí teorie funkcionálu hustoty (DFT) jsou ideálním nástrojem pro zkoumání a vysvětlení fyzikálních a chemických procesů, které probíhají během adsorpce. Elektronové vlastnosti jsou studovány pomocí výpočtů pásové struktury a Baderovy analýzy náboje. Nedávná experimentální zjištění odhalila, že při nízké koncentraci atomy Ga dopují grafen elektrony (n-dopování). Tento dopovací efekt se snižuje při vyšších koncentracích Ga atomů, kdy dochází ke tvorbě klastrů. Tato práce představuje adsorpci jednotlivých atomů Ga a klastrů tvořených více atomy Ga. Zatímco jednotlivé atomy n-dopují grafen 0,64 elektrony, atomy vázané v klastrech na sebe vzájemně působí, a tím oslabují dopování grafenu. Tvorba klastrů je zásadně ovlivněna difuzí atomů Ga po povrchu grafenu. Proto je část práce věnována výpočtům energie difuzní bariéry a tomu, jak může být tato bariéra ovlivněna nabitím grafenu. Experimentální pozorování ukazují, že u grafenu jež je vystaven působení molekul vody, dochází k dopování kladnými nosiči náboje (p-dopování). Tato pozorování však nebyla podpořena výpočty DFT. Tato práce zkoumá vliv vícevrstvé vody na elektronové vlastnosti grafenu. Pozornost byla věnována ovlivňování dopování grafenu v závislosti na orientaci molekul vody v první vrstvě nejblíže grafenu. Prezentované výsledky ukazují p-dopování grafenu, když je 6 nebo více vrstev vody orientováno kyslíkem ke grafenu.
How to reduce overheating in Czech towns and village
Hermanová, Veronika ; Kučerová, Zdeňka (referee) ; Pavlovský, Tomáš (advisor)
The aim of this bachelor thesis is to point out raising temperature and climate changes in towns and villages in the Czech Republic. It focuses on the impact of climate changes on health of population as well as impact on public places. It analyses and proposes all possible conceptual solutions to support sustainable development and reduction of the climate impact. The target is to indicate measures of help to nature that will navigate to positive response on the climate changes on streets and public places to achieve comfortable living in the build-up area. Part of the bachelor thesis is personal proposal for the modification of the given public space in the town of Valasske Mezirici, to which individual measures are specifically projected.
Refrigeration unit with the R718 refrigerant
Krupa, Matyáš ; Tuhovčák, Ján (referee) ; Hejčík, Jiří (advisor)
The diploma thesis deals with the design of a cooling system using the refrigerant R718 (water) with a capacity of 5 kW for building cooling. The thesis is divided into three chapters. The first chapter describes the basic principles of cooling systems, thermodynamic cycles, and refrigerants. The following second chapter provides an analysis of the compressor cycle and its individual components – compressor, heat exchangers, and expansion valve. The final third chapter focuses on the actual design of the cooling system, including thermodynamic calculations and determining the basic geometric parameters of the compressor.
Research into the causes of very low friction between wheel and rail
Polnický, Jan ; Hajžman, Michal (referee) ; Omasta, Milan (advisor)
A low traction coefficient causes problems when starting trains, extends the braking distance, and leads to overrunning stations. These problems often occur in conditions of high humidity and low traffic. Oxides on the rail surface form a suspension with water, causing the traction coefficient to drop. This work addresses the mechanisms by which this drop is caused, based on observations using an optical tribometer. Additionally, a study was conducted to map the influence of various parameters on the drop in the traction coefficient. The tested parameters include suspension concentration, the applied amount, the type of base fluid, and others.
Analysis of perfluorinated alkyl compounds in environmental matrices
Šimáková, Anna Marie ; Řezáčová, Veronika (referee) ; Mravcová, Ludmila (advisor)
The bachelor thesis deals with the still topical issue of perfluorinated and polyfluorinated substances in the aquatic environment. In the theoretical part, the production and use of PFASs, which has led to the spread of these pollutants into the environment, is first addressed. Then, their behaviour in the environment is presented, which, due to their properties, results in their persistence in the environment, their ability to accumulate in living organisms and, in the case of decomposition, the possibility of even worse impacts. Exposure can result in carcinogens, hormonal changes and various types of toxicity in living organisms. The theoretical part concludes with methods for possible extraction from different matrices and detection by a suitable analytical method. The experimental part deals with the optimization of parameters for the method of determination and extraction of perfluorinated and polyfluorinated substances from water. All parameters were optimized to achieve the highest possible recoveries with acceptable repeatability and to achieve the lowest possible limits of detection and quantification.
Football Recycling
Longauerová, Romana ; Sládeček, Svatopluk (referee) ; Sedlák, Jaroslav (advisor)
The final work responds to the global warming trend in the form of a park zone with edible vegetation. This serves as a food source for the residents and also supports the species biodiversity near the city centre. The design makes use of natural resources and creates an efficient rainwater harvesting system from the adjacent area surrounding the site. The heart of the site becomes the former football stadium building, which is used as a community garden and for educational purposes in conjunction with agriculture and nature.
Intercurricular teaching programme Fish of our waters
The aim of the thesis was to create a proposal for a teaching programme focused on the issue of fish occurring in the Czech Republic, in order to facilitate the work of teachers who can use the activities during their personal practice. The first part of my thesis focuses on the issues of water around us (lakes, ponds, running waters) and on some of the fish species living in the Czech Republic which are introduced to pupils in primary school lessons. The second part focuses on the design of a cross-curricular teaching programme, which includes tools such as worksheets, pictures, etc. Last but not least, reflection from practice and evaluation tests are included to verify the effectiveness of the proposed activities. The results show that after the implementation of the proposed activities, students have an overview of fish and everything related to them. They know some of the representatives, they can tell what fish needs to live, what it looks like, describe its body, distinguish between freshwater and marine fish, know what they breathe, what the fish's lateral line is for, etc. They also know what a fisherman needs to own when he wants to catch a fish and that it is not an easy job.
Urban design of waterfront in Třebíč
Vacek, Jiří ; Ležatka,, Lukáš (referee) ; Pavlovský, Tomáš (advisor)
Thesis is concerning urbanistic treatment of Jihlava river embankment in the city of Třebíč. Tries to find cause for urban non-functionality of the area within local and wider context to its surroundings. Offers possible solution for rehabilitation of the urbanistic function of the embankment, including putting the embankment into role of important passageway, improving its bounds to the surroundings and active role in city's everyday life.
Thermal baths Yverdon, five senses in architecture
Poláš, Michal ; Uřídilová, Marcela (referee) ; Koleček, Ivan (advisor)
The architecture of the spa in the park is conceived as a structure goes through the trees. Spa is space for using thermal spring force.

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